Human impacts alter the distribution of fish functional diversity in Neotropical stream system

Biotropica ◽  
2021 ◽  
Vol 53 (2) ◽  
pp. 536-547
Author(s):  
Lucas Milani Pereira ◽  
Bárbara Dunck ◽  
Evanilde Benedito
Keyword(s):  
Functional Diversity ◽  
Human Impacts ◽  
Stream System ◽  
Neotropical Stream ◽  
Distribution Of Fish

scholarly journals Functional diversity of phytoplankton highlights long-term gradual regime shift in the middle section of the Danube River due to global warming, human impacts and oligotrophication

2018 ◽  
Vol 63 (5) ◽  
pp. 456-472 ◽  
Author(s):  
András Abonyi ◽  
Éva Ács ◽  
András Hidas ◽  
István Grigorszky ◽  
Gábor Várbíró ◽  
...  
Keyword(s):  
Global Warming ◽  
Functional Diversity ◽  
Regime Shift ◽  
Human Impacts ◽  
Danube River ◽  
Middle Section ◽  
The Danube River

scholarly journals Trait-based predation suitability offers insight into effects of changing prey communities

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5899 ◽  
Author(s):  
Benjamin Weigel ◽  
Erik Bonsdorff
Keyword(s):  
Functional Diversity ◽  
Prey Species ◽  
Human Impacts ◽  
Food Resource ◽  
Food Resources ◽  
Trophic Levels ◽  
Important Species ◽  
Coastal System ◽  
Predator Diet ◽  
Positive Effect

Increasing environmental pressures and human impacts are reshaping community structures and species interactions throughout all trophic levels. The morphological and behavioural characteristics of species communities contain key ecological information on why prey species appear attractive to predators but are rarely applied when exploring predator-prey (PP) relationships. Expanding our knowledge on how changing prey communities can alter the food resource suitability (RS) for predators is vital for understanding PP dynamics in changing ecosystems. Detailed predator diet data are commonly restricted to commercially important species and often not available over long temporal scales. To find out whether structural changes of prey communities impact the food RS for predator communities over space and time, we apply a novel framework to describe and interpret changes in predator diet-suitability based on predation-relevant traits of prey. We use information on described feeding links from the literature to compile the prey spectrum for each predator and subsequently translate the prey-species into a prey-trait spectrum. For each predator, we then calculate a frequency-based prey-trait affinity score and relate it to the available food resource pool, the community weighted means of prey traits, resulting in a prey-suitability measure. We aim to reveal whether a described multi-decadal change in the community structure of zoobenthos had an impact on the food suitability for the benthic-feeding fish in a coastal system of the Baltic Sea. We assess the direction of change in resource quality from the perspective of benthic-feeding fish and describe predator-specific responses to examine which species are likely to profit or be disadvantaged by changes in their prey spectrum. Furthermore, we test the relationship between functional diversity of prey communities and food suitability for predators, and whether predation linkage-structures are affected through prey community-changes. Our results show that changes in zoobenthic communities had a positive effect on the food suitability for most benthic-feeding fish, implying more suitable food resources. Species-specific responses of predators suggest varying plasticity to cope with prey assemblages of different trait compositions. Additionally, the functional diversity of zoobenthos had a positive effect on the food suitability for predator fish. The changing trait compositions of prey influenced the PP linkage-structure, indicating varying specialisation of benthic feeding fish towards available food resources. Our findings suggest that changing morphological characteristics of prey can impact food RS features for its predators. This approach enables long-term evaluation of prey quality characteristics where no detailed diet data is available and allows for cross-system comparison as it is not relying on taxonomic identities per se.

scholarly journals Floodplain land cover affects biomass distribution of fish functional diversity in the Amazon River

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Caroline C. Arantes ◽  
Kirk O. Winemiller ◽  
Alex Asher ◽  
Leandro Castello ◽  
Laura L. Hess ◽  
...  
Keyword(s):  
Land Cover ◽  
Functional Groups ◽  
Functional Diversity ◽  
Forest Cover ◽  
Amazon River ◽  
Fish Biomass ◽  
Biomass Distribution ◽  
River Floodplain ◽  
Functional Richness ◽  
Distribution Of Fish

Abstract Land-cover change often shifts the distribution of biomass in animal communities. However, the effects of land-cover changes on functional diversity remain poorly understood for many organisms and ecosystems, particularly, for floodplains. We hypothesize that the biomass distribution of fish functional diversity in floodplains is associated with land cover, which would imply that fish traits affect behavioral and/or demographic responses to gradients of land cover. Using data from surveys of 462 habitats covering a range of land-cover conditions in the Amazon River floodplain, we fitted statistical models to explain landscape-scale variation in functional diversity and biomass of all fish species as well as subsets of species possessing different functional traits. Forest cover was positively associated with fish biomass and the strength of this relationship varied according to functional groups defined by life history, trophic, migration, and swimming-performance/microhabitat-use traits. Forty-two percent of the functional groups, including those inferred to have enhanced feeding opportunities, growth, and/or reproductive success within forested habitats, had greater biomass where forest cover was greater. Conversely, the biomass of other functional groups, including habitat generalists and those that directly exploit autochthonous food resources, did not vary significantly in relation to forest cover. The niche space occupied by local assemblages (functional richness) and dispersion in trait abundances (functional dispersion) tended to increase with forest cover. Our study supports the expectation that deforestation in the Amazon River floodplain affects not only fish biomass but also functional diversity, with some functional groups being particularly vulnerable.

SPATIAL DISTRIBUTION OF FISH DIVERSITY IN GODAVARI RIVER AT AMBAD STRETCH

2019 ◽  
Vol 34 (1-2) ◽  
pp. 81-93
Author(s):  
D. D. BHUTEKAR ◽  
◽  
S. B. AHER ◽  
M. G. BABARE ◽  
◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Fish Diversity ◽  
Godavari River ◽  
Distribution Of Fish

Characteristics of Macroinvertebrates Food Webs affected by Dry Channel in an Intermittent Stream System of the Echi River in Japan

2015 ◽  
Vol 6 (3) ◽  
pp. 167
Author(s):  
Hyun-Seon Shin ◽  
Amahashi Nozomi ◽  
Young-Eun Na ◽  
Hong-Hyun Park ◽  
Kwang-Jin Cho ◽  
...  
Keyword(s):  
Food Webs ◽  
Intermittent Stream ◽  
Stream System
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